Memory Controller
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
10-37
10.9.6
Dual-Mapping Option Register (DMOR)
,
7:9
—
Reserved
10:12
AT
Address type. This field can be used to specify that accesses involving the memory bank are
limited to a certain address space type. These bits are used in conjunction with the ATM bits
in the OR. The default value at reset is to map data only. For a full definition of address types,
refer to
Section 9.5.8.6, “Address Types
.”
13:27
—
Reserved
28:30
DMCS
Dual-mapping chip select. This field determines which chip-select signal is assigned for dual
mapping.
000 CS0
001 CS1
010 CS2
011 CS3
1xx Reserved
31
DME
Dual mapping enabled. This bit indicates that the contents of the dual-mapping registers and
associated base and option registers are valid and enables the dual-mapping operation. The
default value at reset comes from the internal data bus that reflects the reset configuration
word. See
Section 10.5, “Dual Mapping of the Internal Flash EEPROM Array
,” for more
information.
0 Dual mapping is not active
1 Dual mapping is active
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Field
—
AM
1
—
ATM
—
HRESET
0000_0000_00
001
000
Addr
0x2F C144
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
LSB
31
Field
—
HRESET
0000_0000_0000_0000
1
It is recommended that this field hold values that are the power of 2 minus 1 (e.g., 2
3
- 1 = 7 [0b111]).
Figure 10-26. Dual-Mapping Option Register (DMOR)
Table 10-11. DMBR Bit Descriptions
Bits
Name
Description
Summary of Contents for MPC561
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